go Hybrid; or at least install a generator to charge batteries.
simplest hybrid is a liquid fuel powered engine on one axle and elecric on the other. on uphills you kick in the lying in wait motor or engine to help keep highway speeds. Same for take off from dead still. On flat cruiseing (and while crawling) you use just one motor/axle. Kick in both for 4wd.
Liquid motor gas or diesel could have a generator to charge battaries. I say diesel to get low end torqe.
simplest hybrid is a liquid fuel powered engine on one axle and elecric on the other. on uphills you kick in the lying in wait motor or engine to help keep highway speeds. Same for take off from dead still. On flat cruiseing (and while crawling) you use just one motor/axle. Kick in both for 4wd.
Liquid motor gas or diesel could have a generator to charge battaries. I say diesel to get low end torqe.